Martha Speaks"Paws and Effect/The Trouble with Teddy"
Paws and Effect - When Martha gets a piece of glass in her paw, everyone realizes that littering hurts more than the environment. But what can they do about it? As Alice, Helen, and TD know, protecting the environment (and paws) is important, but it is easier said than done. Vocabulary: (E) discard(ed)(ing), litter(ed)(ing), thoughtless, debris, recycle(d)(ing) (I) careless(ly), trash, important, broke(n), injured. D

3:00 pm

Peg + Cat"The Messy Room Problem/The Golden Pyramid Problem"
The Messy Room Problem - Peg's Room. Peg and Cat sort through the mess in Peg's room just in time for company to come over and see Cat's masterpiece, "The Circles." Primary Content: Sorting; Secondary Content: Shapes. D

3:30 pm

WordGirl"Earth Day Girl/A Hero, A Thief, A Store and Its Owner"
Earth Day Girl - When the Birthday Girl learns that the Earth is having a special celebration (on her birthday!) she decides to teach the Earth a lesson. Will WordGirl find a way to stop the Birthday Girl and save Earth Day? Vocabulary Words: Recycle, Excess. A Hero, A Thief, A Store and Its Owner - A police officer arrives at the Jewelry Store only to find Reginald, Chuck, Captain Huggy Face, and WordGirl encased in condiment cocoons. D

4:00 pm

Wild Kratts"Attack of the Tree Eating Aliens"
The Wild Kratts get an urgent call from a group of North American Wild Kratts kids telling them almost all of the trees in the forest are dying. It's a race against time to solve the mystery and help the forest and the creatures who live there. D

4:30 pm

Cyberchase"The Cyberchase Movie, Part 2"
Hacker's careless drilling on Ecotopia set off a slime geyser, which destroyed many animals' habitats. After teaming up with Ollie (guest star Rico Rodriguez) to restore harmony, the CyberSquad learns that rescuing animals isn't their only problem. Ollie's mom has gone missing too. D

5:00 pm

Fetch! With Ruff Ruffman"How to Break The Ice and Also Waddle On It"
Ruff is getting ready to attend the annual convention for ARGSHAABPO, the Animal Reality Game Show Host and Aquatic Bird Performer Organization. Unfortunately, the convention will be attended by penguins, and Ruff just can't seem to relate to them. So he sends Isaac to the New England Aquarium to meet up with some penguins to get some pointers; and he sends Brian, Bethany, and Liza to learn the art of improvisation. D

5:30 pm

Nightly Business Report
Tonight on Nightly Business Report, $65b worth of pharmaceutical deals in the past 24 hours. What's driving them and should investors expect more? And, inside the Supreme Court case that could shake up the television industry and change how people watch TV. D

Fake Or Fortune?"Gainsborough"
The team faces a daunting challenge as they search for lost masterpieces in Britain's public art collections. More than 100,000 oil paintings have been photographed and posted online as part of the Your Paintings initiative - 17,000 of them listed as "artist unknown. " Philip and his colleague Bendor Grosvenor believe they've identified several missing works by artist Thomas Gainsborough. D

8:00 pm

Pioneers of Television"Doctors and Nurses"
From George Clooney on "ER" to Richard Chamberlain on "Dr. Kildare," television's long love affair with doctors and nurses shows no signs of letting up. Noah Wyle, Anthony Edwards, Gloria Reuben and Eriq LaSalle open up about the secrets of "ER" while Howie Mandel, Ed Begley Jr. and Christina Pickles revisit "St. Elsewhere."G

9:00 pm

American Masters"A Fierce Green Fire"
Experience the battle for a living planet in the first big-picture exploration of the environmental movement, spanning 50 years of grassroots and global activism. Narrated by Robert Redford, Ashley Judd, Van Jones, Isabel Allende and Meryl Streep.G

10:00 pm

Frontline"Solitary Nation"
An estimated 80,000 Americans are in solitary confinement - sometimes for years, or even decades. Using extraordinary access to the segregation unit at the maximum-security Maine State Prison, FRONTLINE examines America's use of solitary confinement - a practice U.S. prisons and jails resort to more than most other countries.G